A powerful piece Ruth. I wonder did you think about this? It is almost in sonnet form - if you lost one of the quatrains then it would be, sonnet form is powerful for expressing love and the loss of love so I think it would be worthwhile to change it. Also this line:-

You are the unreal numbers that express my sum

Would I think be more powerful if you introduced the mathematical idea of 'unreal' numbers that are called complex numbers. These are numbers that involve the square root of ' -1 ' Such numbers are completely unreal since (-1) x (-1) = +1 and there is no way that any real number multipied by itself can give -1. The Square root of -1 is called 'i'. Though it cannot exist it can still be used in mathematical equations and give valid answers as long as at some point you multiply i by i and get -1

EG (x-i)(x+i) = x^2 + ix -ix -1 = x^2 -1

so the solution to the equation x^2 -1 = 0 is

x = i or x = -i

So you could say:-

You are the complex numbers that express my sum

And have a reference to some difficult mathematics, and at least those of us who know a bit of higher mathematics would get something extra out of it:-)